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raw_ostream::operator<<(StringRef): Avoid potential overflow in pointer arithmetic.

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(OutBufCur + Size) might overflow if Size were large. For example on i686-linux,

  OutBufCur: 0xFFFDF27D
  OutBufEnd: 0xFFFDF370
  Size:      0x0002BF20 (180,000)

It caused flaky error in MC/COFF/section-name-encoding.s.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207621 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi
2014-04-30 09:33:50 +00:00
parent 5b188b1cb8
commit 5f4aba6c8a
1 changed files with 1 additions and 1 deletions
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2
include/llvm/Support/raw_ostream.h
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@@ -162,7 +162,7 @@ public:
size_t Size = Str.size(); size_t Size = Str.size();
// Make sure we can use the fast path. // Make sure we can use the fast path.
if (OutBufCur+Size > OutBufEnd) if (Size > (size_t)(OutBufEnd - OutBufCur))
return write(Str.data(), Size); return write(Str.data(), Size);
memcpy(OutBufCur, Str.data(), Size); memcpy(OutBufCur, Str.data(), Size);